[1] Lakshmikantham V, Bainov D D, Simeonov P S. Theory of impulsive differential equations. Singapore: World Scientific, 1989

[2] Hale J K, Sjoerd M, Verduyn L. Introduction to Functional Differential Equations. Applied Mathematical Sciences, 99. New York: Springer Verlag, 1993

[3] Yoshida N. Oscillation Theory of Partial Differential Equations. Singapore: World Scientific, 2008

[4] Wu J H. Theory of Partial Functional Differential Equations and Applications. New York: Springer, 1996

[5] Wu J H, Xia H X, Sjoerd M. Self-sustained oscillations in a ring array of coupled lossless transmission lines. J Differ Equ, 1996, 124(1): 247–278

[6] Chang Y K, Anguraj A, Arjunan M M. Existence results for impulsive neutral functional differential equations with infinite delay. Nonlinear Analysis: Hybrid Systems, 2008, 2(1): 209–218

[7] Kavitha V, Arjunan M M, Ravichandran C. Existence results for a second order impulsive neutral functional
integrodifferential inclusions in Banach space with infinite delay. J Nonl Sci Appl, 2012, 5: 321–333

[8] Erbe L, Freedman H, Liu X Z, Wu J H. Comparison principles for impulsive parabolic equations with application to models of single species growth. J Aust Math Soc, 1991, 32: 382–400

[9] Yan J R, Kou C H. Oscillation of solutions of impulsive delay differential equations. J Math Anal Appl, 2001, 254: 358–370

[10] Agarwal R P, Meng F W, Li W N. Oscillation of solutions of systems of neutral type partial functional differential equations. Comput Math Appl, 2002, 44(5): 777–786

[11] Luo J W. Oscillation of hyperbolic partial differential equations with impulses. Appl Math Comput, 2002, 133(2/3): 309–318

[12] Cui B T, Han M A. Oscillation theorems for nonlinear hyperbolic systems with impulses. Nonlinear Anal: RWA, 2008, 9(1): 94–102

[13] Wang J Z, Meng F W, Liu S Y. Integral average method for oscillation of second order partial differential equations with delays. Appl Math Comput, 2007, 187: 815–823

[14] He M X, Liu A P. Oscillation of hyperbolic partial differential equations. Appl Math Comput, 2003, 142: 205–224

[15] Liu A P, He M X. Oscillatory properties of the solutions of nonlinear delay hyperbolic differential equations of neutral type. Appl Math Mech, 2002, 23(6): 678–685

[16] Liu A P, Xiao L, Liu T. Oscillation of nonlinear impulsive hyperbolic equations with several delays. Elect J Differ Equ, 2004, 2004(24): 1–6

[17] Liu A P, Ma Q X, He M X. Oscillation of nonlinear impulsive parabolic equations of neutral type. Rocky Mountain J Math, 2006, 36(3): 1011–1026.

[18] Shoukaku Y, Yoshida N. Oscillation of nonlinear hyperbolic equations with functional arguments via Riccati method. Appl Math Comput, 2010, 217: 143–151

[19] Shoukaku Y. Oscillation of solutions for forced nonlinear neutral hyperbolic equations with functional arguments. Elect J Differ Equ, 2011, 2011(59): 1–16

[20] Deng L H, Mu C L. Oscillation of solutions of the systems of quasilinear hyperbolic equation under nonlinear
boundary condition. Acta Math Sci, 2007, 27B(3): 656–662

[21] Hassan T S, Erbe L, Peterson A. Forced oscillation of second order differential equations with mixed nonlinearities. Acta Math Sci, 2011, 31B: 613–626